A non-contact power transmission system for vertical drilling system

Abstract

The invention discloses a non-contact electric energy transmission system for a vertical drilling system. The non-contact electric energy transmission system comprises a transformer, a series resonant inverter circuit, a rectification output circuit and an inverter control circuit, wherein the transformer is a separate transformer which comprises primary magnetic cores and secondary magnetic cores which are separated from one another; a plurality of grooves which are formed along the axis are formed in the outer circular surface of a power main shaft of the drilling system and in the inner circular surface of a hole straightening loop respectively; the primary magnetic cores are arranged in the grooves of the power main shaft; the secondary magnetic cores are arranged in the grooves of the hole straightening loop; the central angle theta formed by the circular arcs on the surfaces of the secondary magnetic cores opposite to the axis of the power main shaft meets a certain relationship, so that the magnetic resistance between the primary magnetic cores and the secondary magnetic cores is constant and is not affected by rotary motion; the phase difference between the voltage and the current is calculated by detecting an output voltage signal and an output current signal of the inverter circuit; the system is kept to work in a resonant state by adjusting the switching frequency, so that the hardware circuit is simplified and the flexibility for phase detection is improved.

Description

technical field [0001] The invention relates to the field of oil and natural gas drilling, more specifically, the invention relates to a non-contact electric energy transmission device between a power spindle and a deflection correcting looper in an automatic vertical drilling system. Background technique [0002] Western oil fields such as Tarim, Karamay, and Yumen are important oil and natural gas bases in my country, and oil and gas production in western China is directly related to national economy, people's livelihood and national defense security. Due to the high and steep structural strata drilled in the western region, and the well depth is relatively deep, the wellbore is easy to deviate, and the drilling speed is low. The anti-deflection and fast drilling have become the bottleneck of drilling technology in the western oil and gas development. The current conventional well deviation control technology is difficult to guarantee the well deviation control effect for ...

AI Technical Summary

Problems solved by technology

However, this method does not take into account the influence of load and ambient temperature changes on the system resonant frequency

[0008] Other patents related to non-contact power transmission are all aimed at the application of ground equipment (see CN101540554A, CN1015521223A, CN101026033A), without considering the harsh conditions such as underground high temperature, high pressure, strong vibration and shock, small structural space and mud erosion, so they cannot be used Automatic Vertical Drilling Tools

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